Tether by ethernet?

I'm currently tethering to my router using Foxfi. From my router I have several wired connections. I'm going from 30mbs download to just 4-5mbs over Foxfi wifi. If possible, I would like to wire my S3 directly to my router. Has anyone experimented with usb to ethernet tethering? I've read about several devices doing the opposite with ethernet out to gain internet access. Some say this adapter works great....
http://www.trendnet.com/products/pro...=280_TU2-ET100